砷污染高原湖滨湿地沉积物对磷酸盐的吸附能力及影响因素探究  

Sorption of phosphate on the arsenic contaminated sediment in plateau lakeside wetland and the related impact factors

作　　者：赵蓉 刘云根[1,2] 侯磊 杨桂英[1,2] 王妍 齐丹卉[1] 李梦莹 任伟[1] ZHAO Rong;LIU Yungen;HOU Lei;YANG Guiying;WANG Yan;QI Danhui;LI Mengying;REN Wei(College of Environmental Science and Engineering,Southwest Forestry University,Kunming Yunnan 650224;Research Institute of Rural Sewage Treatment,Southwest Forestry University,Kunming Yunnan 650224)

机构地区：[1]西南林业大学环境科学与工程学院,云南昆明650224 [2]西南林业大学农村污水处理研究所,云南昆明650224

出　　处：《环境污染与防治》2018年第8期855-859,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.31560147;No.51469030);云南省应用基础研究计划青年项目(No.2016FD042);西南林业大学林学一级学科后备人才计划项目

摘　　要：选取云南阳宗海湖滨湿地沉积物为研究对象,以阳宗海农田土壤为对照,通过室内模拟实验,研究不同砷污染程度的沉积物对磷酸盐吸附的差异及影响因素。结果表明:(1)低浓度磷酸盐时吸附能力为底层沉积物>表层沉积物>农田土壤;高浓度磷酸盐时吸附能力为表层沉积物>底层沉积物>农田土壤;主要与沉积物表面的吸附点位的分布差异有关。(2)砷污染沉积物中活性态砷的含量及水体pH是影响沉积物富集磷的重要因素。(3)可还原态砷、水体pH、弱酸提取态砷对磷酸盐的吸附有重要贡献。Sediments in Yangzonghai lakeside wetland was selected as the research object,farmland soil around the lake bank was chosen for comparison.The sorption differences of phosphate on different pollution degree of arsenic contaminated sediments and the related impact factors were studied through indoor simulation experiment.The results showed that:(1)the sorption sequence was DC(bottom layer sediment)>BC(surface layer sediment)>NT(farmland soil)under the low initial phosphate concentrations,whereas it changed into BC>DC>NT under the high initial concentrations.The main influencing factors lay on the distribution differences of sorption sites of sediments.(2)The activity of arsenic and pH of water body had important effects on the sediment accumulation ability of phosphate.(3)Among these factors,weak acid extraction and reducible arsenic in sediment and the water body pH made significant contributions to the sorption of phosphate.

关 键 词：阳宗海湖滨湿地 砷污染 磷酸盐吸附 影响因素 

分 类 号：X524[环境科学与工程—环境工程]